Wire-insulating machine.



F. D. PLATTER.

WIRE INSULATING MAOHINB.

APPLIOATION FILED JUNE 10, 1906. Patented Apr. 20

6 EHEETS-SHEBT 1I F. D. PLATTER. WIRE INSULATING MACHINE.

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F. D. PLATTER. WIRE INSULATING MAUHINB.

APPLICATION YILBD JUNE 10, 1905.

Patented Apr.20, 1909. 6 SHEETS-SHEET 3.

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F. D. PLATTER. WIRE INSULATING MACHINE. APPLIOATIQN FILED JUNE 1o, 1905.

6 SHEETS-SHEET Q Patented Apr. 20, 1909.

I'. D. PLATTER. WIRE INSULATING MACHINE. Arrmoulon mln Juni: 1o. 1905.

Patented Apr.20,1909. 6 SHEETS-'SHEET 5.

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P. D. PLATTER.

WIRE INSULATING MAGHINE.

APrLmATxoN FILED, JUNI: 1o, 1905.

91 8,590. Patented Apr. 2o, 1909.

BSHEETS-SHEET UNITED STATES PATENT OFFICE.

FRAN K D. PLAT'IER, OF CHICAGO, ILLINOIS, ASSIGNOR TO WESTERN ELECTRICCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

WIRE-INSULATING MACHINE Specification of Letters Patent.

Patented April 20, 1909.

Application filed June 10. 1905. Serial No. 264,570.

To all whom it may concer-n.'

Be it knovvn that I, FRANK D. Pnvr'rnn, citizen of the United States7residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in lire-Insulating`Machinos` of which the following is a. full, clear, concise, and exactdescription.

My invention relates to a machine for insulating Wire, and has for itsobject to provide an improved and compact machine which will requirepractically no skill and the minimum amount of attention on the part ofthe operator and which will be reliable and efficient in operation.

My aim has also been to construct a machine which will avoid the troubleheretofore experienced caused by the unnoticed interruption of thesupply of thread or yarn, or the impro )er Winding of the thread uponthe wire, and the consequent Winding of a large amount of bare orimproperly Wound wire upon the spool with the covered Wire.

In insulatin machines heretofore constructed, the inc ividual heads ofthe machine have been driven by belts from a main driving shaft beltedto the line shaft, but this type of machine required constant attentionon the part of the operator to keep the belts in proper adjustment. Theattendant must give constant attention to the machine, furthermore, inorder to prevent the spooling of a large quantity of bare or improperlycovered Wire. Another objection to such machines was that repairs werefrequently necessary, and considerable ditliculty and expense wereencountered, due to the breaking and Wearing out of the belts.Insnlating machines have also been designed employing gearing forconnecting the individual heads to the main driving shaft, but thesemachines also required constant attention.

My invention contemplates a machine comprising a number of rotary copcarriers mounted in compact form Within a suitable framework. The Wireassociated with each carrier is led through the carrier and the cop ofinsulating material supported-there; by. and the carrier in its rotationWinds the material upon the Wire. A main driving shaft is carried bv theframe, and earing is provided for each carrier adapter to drive thesame. The. operative connection of the gearing of each carrier 4with thedriving shaft is controlled by clutch mechanism individual to suolicarrier, and the clutch mechamsm of each carrier may be operated to stopor start said carrier Without in any way affecting the clutch mechanismassociated with the other carriers.

The driving shaft may carry a number of gear wheels loosely mountedthereon, one being provided for each carrier, which is adapted whenrotated to drive the same. The clutch which controls the operativeconnection of the gear wheel with the shaft comprises two members, oneof said members being loosely mounted upon the shaft and .in frictionalengagement with said gear wheel. the other member of the clutch beingsplined to rotate with the drivin shaft. tith this arrangement, when thecIutch is closed, the gear Wheel, slips upon the clutch member withwhich it is in frictional engagement and said gear and the carrierdriven thereby are gradually brought up to speed. This result is ofgreat advantage, since it enables the thread to be initially fed to theWire without danger of breaking, and prevents injury to the clutchmembers when they are thrown into engagement.

Another feature of the invention consists in the means Which I haveprovided for controlling the engagement of the clutch members. A leverengages the splined member of the clutch and is adapted to be rocked toclose or open the clutch. I preferably provide a handle for rockin thelever in a direction to close the clutc i. Then the supply of thread tothe Wire is interrupted or the thread improperly Wound upon the vvire,electromagnetic mechanism is automatically operated to release the leverto rock in a direction to open the clutch. To this end I provide a`magnet in a circuit terminating upon the frame of the machine and aninsulated Contact member through which the Wire passes after beingcovered. The bare Wire is in contact with the frame of the machine andwhen it engages the insulated contact it completes a circuit for themagnet., which is thereby energized to open the clutch. Vith thisarrangement it Will be seen that. the objectionable spooling of the bareWire or improperly insulated Wire Will be avoided.

A further feature of the invention consists in the provision ofautomatic brakin mechanism for the carrier. A frictional rake isassociated with the carrier adapted to be rendered inoperative when theclutch is closed.

The electromagnet referred to above is adapted when energized upon theengagement of the bare wire with the insulated contact member to releasethe clutch which at the same time will bring the brake into engagementwith the carrier, so that the same 1s stopped almost simultaneously withthe opening of the clutch. I prefer to provide a lever for operating thebrake adapted to be operated practically simultaneously with the clutchlever.

A still further feature of my invention is the arrangement by which Imount the individual heads, making each head a unit which may be readilyremoved from the frame of the machine and replaced by a new one withoutdisturbing the operation of other heads. This arrangement consists ininclosing the gearing and mounting the bearin s of a cop carrier in aniron frame or casing through which projects a small gear adapted whenthe casing is in place upon the frame, to mesh with a large gear on themain driving shaft, this casing being held in place by means of screwswhich are readily removed allowing the carrier and its operatingmechanism to be lifted as a unit out of the frame and replaced by a newone While the machine is in operation.

I will describe my invention more particularly by reference to theaccompanying drawings which illustrate the preferred embodiment thereof,and the particular parts, improvements or combinations which I regard asnovel will be pointed out in the appended claims.

Figure l is a front elevation of the wire insulating machine embodyingmy invention; Fig. 2 is an end elevation of the machine; Flg. 3 is avertical sectional view of a single head of the machine on line 3 3 ofFig. 1; Fig. 4 is a sectional plan View on line 4 4 of F 1g. 3; Fig. 5is a View in elevation of a portion of a single head; Fig. 6 is asectional view on line 6-6 of Fig. 4; Fig. 7 is a detail view of thelevers for operating the clutch and brake; Fig. 8 is a verticalsectional view of a portion of one of the heads of the machine; Fig. 9is a diagram illustrating the circuit connections of a single head;Figs. 10, ll, 12, 13 and 14 are detail views of the clutch mechanism;and Fig. 15 is a detail view of the catch upon the clutch lever.

The same characters of reference are used to designate the same partswherever shown.

The machine shown contains two rows of individual heads A mounted uponopposite sides of the machine, each head being adapted to cover wirewith insulating material, such as cotton yarn or thread. Each head isprovided with a cop a of insulating thread mounted upon a rotar carrierb. The wire to be covered is led rom a spool c through the carrier andcop and around a capstan d, the carrier in its rotation winding thethread from the cop a around the bare wire, which is finally received bythe spool c rotated by a belt o: driven by the capstan (l. The cop, itwill be understood, is loosely mounted upon the carrier and the threadis led through ar hook b upon the carrier to the wire.

A pair of main driving shafts f j', one for each row of heads, extendhorizontally through the frame, lying between the row of heads, theshafts being connected by gearing with the shaft of an electric motormounted upon the base of the frame. The rotary carrier of each head isconnected with the driving shaft associated with the row of carriers inWhich it is included by gear ing under the control of clutch mechanismindividual to said carrier. The clutch mechanism of any carrier may beoperated to bring the gearing into operative relation to the drivingshaft to rotate the gearing and carrier or may render the gearinginoperative, to stop the carrier Without affecting the carriers of theother heads. Each carrier is provided with a gear wheel y looselymounted upon the shaft f and con nected by intermediate gearing' withthe shaft b3 of the carrier b. The operative connection of the gearwheel g with the shaft f is controlled by a clutch L comprising twomembers 7L h2, the member it being loosely mounted upon the shaft andinclosed by the gear wheel g, which lies in frictional engagement withthe periphery thereof. The other member of the clutch is splined torotate with the shaft and is adapted to be moved along the shaft into orout of engagement with its mate h', the two parts having teethY adaptedto mesh together. The member h2 of the clutch may be provided withlongitudinal slots it therein in which keys h4 f1.4 secured to the shaftare adapted to ride to spline the clutch member to the shaft.

The clutch member la. is provided with a number of holes la. h5 in itsperiphery in which are mounted frictional pins it LG, preferably offiber, these pins being curved at their end with a curvature slightlygreater than that of the inside surface of the gear g, springs LT 71,7being located within the holes to bear against the pins and force thesame outwardly against the inner surface of the gear g, to maintain aconstant and uniform frictional engagement between the clutch member itand the gear g and to take up any wear between said parts. By having thecurvature of the fiber pins as indicated it is possible to account forthe wear of the pins and the consequently decreasing pressure of thesprings, for as the pins wear, their surface of contact increases, andas the surface of contact is increased so the pressure of the springs isdecreased.

By this means I am enabled to provide an almost constant frictionalengagement. The gear g is pre'ferably hollow and condnfises a hub g2loosely mounted directly upon the driving shaft and connected by a webgt with the outer driving shell g, the clutch member /i being looselymounted upon said hub between the same and the shell The clutch memberz. is confined within the gear g by a suitable plate secured to the faceot' the shell gr'. Said hub g may be provided with a pair of annulargrooves g3 in its inner surface which may be filled with graphite to actas a lubricant. The keys /L4 may be carried upon a collar L" secured tothe dri ving shaft and abutting against the end of the hub (2. Theclutch member l1? may be mounted to slide longitudinally upon said hubsg2 L". It will thus be seen that when the clutch is closed, the carrierwill not be immediately brought up to the speed of the shaft owing tothe frictional engagement between the member h of the clutch and thegear g, but, due to the slip, will be gradually accelerated until` itreaches the desired speed.

The clutch mechanism above described forms no part of the presentinvention, but constitutes the subject-n'iatter of a divisionalapplication, Serial No. 347,124, tiled December 10th.y 1906.

I show the gear g meshing with a pinion gts carried by a shaft cZconnected by reduction gearing (Z2 with the capstan (l, the shaft clcarrying a gear b4 meshing with a pinion b5 carried by the shaft Lsupporting the carrier 7J. Thus when the clutch is closed, the carrier,capstan and spool will be gradually and uniformly brought up to speed.

Referring to Fig. 8, I provide a easing b3 in which are mounted thegears drivin the cop carrier, the said casing forming a so a frame forbearings 012 bm of the carrier. rThe shaft d carrying the small gear gis arranged to be disconnected at the oint d. A series ot screws s* s*shown in Flg. l serve to hold the casing 798 on the frame f4 of themachine proper., said frame having an opening ff' through which thesmall gear g may be drawn. It will thus be seen that by removing thescrews s4 and disconnecting the shaft d at d I may remove the carrierand its driving gears as a unit from the machine and replace it by a newone without in any way disturbing or stopping the operation of the otherheads. The shaft ot the carrier is hollow to permit the passage of thebare wire therethrough. The carrier l) may comprise a base upon whichare mounted the guides 7l for directing the thread from the cop to thewire. the casing having an upturned annular flange b, adapted to supporta guard ot sheet metal, shown in dotted lines in Fig. 5, for the cop.The cop is held in place upon the shaft b by a cap 2'y which fits overthe cud ot thc shaft, the said cap havingl an opening lor the passageoll the bare wire and an c vc through which the thread is lcd to thewire.

A\ rocking arm or lever l; is provided lor opening the clutch i. one endof said lever resting in a groove l1* in a` collar 7i" carried by thespliucd member /f-` ot the clutch, and being :ulapted to be rocked bythc handle /u to ctt'cct the engagement ot the clutch members, thehandle being carried by a` link l. carried b v the liec or opposite endof the rocking arm or lever. rl`he tree end of the rocking arm or lever,to which the handle is attached.y carries a grease reservoir or cup Yr,which is connected by a passage leading through the rocking arm or leverwith the groove in the collar h, a` passage leading to the bearing oi.thc clutch member through holes in the bottom ot' the groove if. tolubricat'e said groove and lwaring together with the thrust bearingoff/1 against r". A magnet Z is provided adapted when energized toeffect the movement of the lever 1 in a direction to open or disengagethe clutch menibers. The lever is provided with a spring J'* which tendsto maintain the same in the position shown in Fig. 7, that is, saidspring tends to move the lever in a direction to open the clutchmembers, but when the lever is rocked by the handle /lf in a directionto close the clutch7 a lever 1" is brought into en gagement with thelink 'g to lock the lever 1 in such position, said lever la beingactuated by a spring T secured thereto. The link lf2 may carry upon theside thereof opposite the handle a pin or hook (as shown in Fig. 7) withwhich the end of lever 7u engages to lock the lever 7.. The end of leverlu is partially out away, as shown in Fig. 7, so that it' will engagethe pin or catch 1 in such manner as to insure the locking of the arm Z.The magnet Z is provided with an armature l pivotally supported by thetrame of the machine and adapted when attracted to strike the lever anddisengage the same from the link fu? allowing the lever Zr to be movedby its slning 7N", to open the clutch. The magnet is arranged to beenergized when the supply of thread from the cop n is inter rupted orthe wire is improperly coveredr` and is in a circuit (see Fig. 9)comprising conductors l, Q3 including a source of current B, conductor 1being connected with the frame of the machine and the conductor 2 beingconnected with a hollow insulated contact member m carried by the frameof the machine and through which the wire passes after being coveredwith the insulating thread. Vhen the .supply of thread to the wire isinterrupted, and the bare wire cngages the hollow contact member in, thesaid member and the frame are connected by the bare wire, and thecircuit for the magnet Z completed, said magnet thereupon operating thelever 1 to open the clutch 7L. In case the wire is improperly orpartially covered, the hare Wire will be intermittently or at shortintervals brought into engagement with the contact member m, whereby thecircuit: of magnet l will he intermittently made and lnolicu. Thearmature l' is normally maintained in its retracted position by asuitable spring. and when the successive impulses of current ariI passedthrough magnet l, said armature \vill he caused to deliver a number ot'sharp blows upon the lever r and thereby eventually disengagc the samefrom stud c2. The contact member 7n arrics at its top a number ofconducting halls` m', in'eferably of metal, which .surround the wirepassing therethrough so that the completion of the circuit 1` 2, whenthe supply of thread is interrupted or the Wire improperly wonn l,willhe insured.

The magnet Z is adapted when energized to automatically open thecircuit, 1, 2, in which is included, and remove the current from thehead, so that the attendant may remedy the dilliculty or remove the bareor improperly covered wire from the spool c and start the head inoperation, Without danger of injury due to the current in the circuit ofthe magnet. To this end I provide a pair of circuit controlling switchsprings Z2 Z2 supported by but insulated from the frame of the machineand serially included in the circuit of magnet Z, the counection whereofis controlled by the lever handle and its link 1?. The link may carry aninsulated plunger l adapted When the lever is rocked in a direction toclose the clutch members to connect the said springs. Yhen, therefore,the magnet is energized, the lever la is rocked to open the clutch andthe plunger Z3 moved to disconnect the terminal springs and break thecircuit of magnet removing current from the head.

I provide a brake n for the carrier Which may comprise a centrallypivoted lever n carrying a brake shoe n2 adapted to engage the base ofthe carrier. The lever u is adapted to be operated by the end of leverle, and when the magnet Z is energized its armature Z causes said leverle@ to be thrown into engagement with the brake lever n', causing theshoe a? to bear against the carrier Z1, so that. the same isautomatically stopped practically simultaneously With the opening of theclutch. The armature Z when attracted moves the lever ic ont ofengagement with the link k2 of the clutch lever and the pin ks when thearm is rocked by thc spring fc5, which throws the lever e intoengagement with the brake lever n to apply the brake to the base of thecarrier.

The machine may carry the usual cam mechanismCfor shifting the guidenger c2 feeding the Wire to the spool e to cause the covered wire to beuniformly and evenly wound thercoii.

I clai n1 1. ln a wire insulating machine, the co1n hinatiou with ail'rame, ol a cop carrier rotatably supported thereon and arranged towind insulating thread from the cop upon a wire, mechanism for drivingsaid cop carrier and for feeding the Wire, a magnet, mechanismcontrolled thereby for stopping said driving mechanism, an insulatedcontact piece with which the wire engages after passing said copcarrier, and a circuit for said magnet including a source of current andhaving its opposite terminals connected, respectively, to said contactpiece and the frame of the machine.

2. In a wire insulating machine, the combination with a frame, of a copcarrier rotatably supported thereon and arranged to wind insulatingthread from the cop upon a Wire, mechanism for driving said cop carrierand for feeding the wire, a magnet, mechanism controlled thereby forstopping said driving mechanism, an insulated hollow contact piecethrough which the Wire passes after passing said cop carrier, and acircuit for said magnet including a source of current and having itsopposite terminals connected, respectively, to said contact piece andthe frame of the machine.

3. In a Wire insulating machine, the combination with a frame, of a copcarrier rotatably supported thereon and arranged to wind insulatingthread from the cop upon a wire, mechanism for driving said cop carrierand for feeding the Wne, a magnet, mechanism controlled thereby forstopping said drivin*r mechanism, an. insulated contact piece with whichthe Wire engages after passing said cop carrier, a circuit for saidmagnet including av source of current and having its opposite terminalsconnected, respectively, to said contact piece and the frame of themachine, and a switch in said circuit automatically opened when saidmagnet operates to stop said driving mechanism.

4l. In a wire insulating machlnc, the combination with a frame, of arotary carrier for a cop of insulating yarn, mechanism, for leading Wireto be covered through said coi and carrier, said carrier in its rotationWin ing yarn from said cop around said Wire, a driving shaft, gearingconnecting said shaft With said rotary carrier, clutch mechanismcontrolling the operation of said gearing, a lever controlling saidclutch, a magnet adapted when energized to operate said lever and openthe clutch, a hollow insulated contact member carried by the frame,through which the Wire passes after being covered, and a circuit forsaid magnet terminatin upon the frame of the machine and sai Contactmember, said circuit terminals being adapted to be connected by the barewire engaging said contact'y member when the supply of yarn isinterrupted.

5. ln a machine for insulating wire. the combination with a carrier fora eop of insulating `vara` means for leading wire through said rop audcarrier, the carrier when rotated winding yarn from the rop upon sa idwire, a shaft for said carrier, a main driving shaft, a rluteh carriedthereby comprising two members, one of said members being looselymounted upon said shaft, a gear inelosing said clutch member and infrietional contact with the periphery thereof, intermediate gearingconnecting said gear with the carrier shaft` a ke f u )on the drivine'Yshaft adapted to ride in a longitudinal slot in the other member of theclutch to spline said clutch member to the shaft alid to pei'- mit thetwo clutch members to be brought into engagement with each other, acollar upon the last-mentioned clutch member having an aniiulai' groovetherein, and a rocking lever resting .in said groove to control theengagement of said eluteh members, whereby when the clutch is closed thecarrier is gradually brought up to the speed of the driving shaft.

(3. ln a wire insulating machine, thc coinbination with a frame, of arotary carrier for a cop of insulating yarn. mechanism for leading wireto be covered through said cop and Carrier, said carrier in its rotationwinding yarn from said cop around said wire, a driving shaft, gearingconnecting said shaft with said rotary Carrier, clutch mechanismcontrolling the operation of said gearing, a lever controlling saidclutch, a handle for said lever for closing said clutch to operate thecarrier, a magnet adapted when energized to operate said lever and openthe clutch, a hollow insulated Contact member carried by the frame,through which the wire passes after being covered. a circuit for said manet terminating upon the frame of the mac iine and said contact member,said circuit terminals being adapted to be connected by the bare wireengaging said contact member when the supply of yarn is interrupted, andballs of conducting material carried upon the top of said Contact memberand surrounding the wi re to insure the completion of said circuit bythe bare wire.

7. In a wire insulatin machine, the combination with a frame, o a rotarycarrier for a co of insulating thread, mechanism for leading Wire to becovered through said cop and carrier, said carrier in its rotationWinding thread from said cop around said wire, a drivin shaft, a gearloosely mounted upon said sha t and adapted to drive said carrier, aclutch controlling the operative connection of said gear with thedriving shaft, a lever controlling said clutch, a handle for operatingsaid lever to close the eluteh and rotate the rarrier, a brake for thecarrier, au operating lever therefor adapted to be withdrawn from saidbrake when the handle is operated to elose the. clutch, a magnet` anarmature therefor adapted when attracted to simultaneously operate saidlevers to open the rlnteli and apply said brake to the carrier, aninsulated contact member through wliieh the wire passes after beingcovered` and a circuit for said magnet terminating upon said contactmember and the frame of the machine, said circuit terminals beingadapted to be connected by the bare wire when the same reaches saidContact member.

S. ln a wire insulating machine, the combination with a rotary carrierfor a rop of insulating thread, means for leading wire to be coveredthrough said cop and carrier, said carrier in its rotation winding thetb read from said cop about said wire, a driving shaft, a` clutchcarried thereby Comprising two members, one of said members beingloosely mounted upon the driving shaft, a

gear wheel inclosing saidV member and in4 frictional Contact with theperiphery thereof, the other member of said clutch being splincd torotate with said driving shaft. means for controlling the engagement ofsaid clutch members, a spool upon which the wire is wound after beingcovered, a capstan for leading the wire to said spool, a shaft d gearedto rotate with said gear wheel, gearA ing connecting said shaft with thecapstan to rotate the saine, a shaft carrying said rotary carrier, andgearing connecting said shaft with the shaft d', whereby the capstan,spool and carrier are gradually and uni formly brought up to speed uponthe closure of the clutch.

9. In a wire insulating machine, the combination with a carrier for acop of insulating yarn, of a shaft upon which said carrier is mounted torotate therewith, the wire to be covered being led through the interiorof said shaft, the carrier in its rotation winding the yarn from saidcop about said wire, a capstan around which the wire is led after beingcovered, a spool for finally receiving the covered wire, mounted torotate with said capstan, a main driving shaft, a clutch carried by theshaft comprising two mein bers, one of said members being looselymounted on the shaft, a Gear wheel in frictioiial contact with saidlutch member, the other member being splined to rotate with said drivingshaft, mechanism controlling the engagement of said clutch members, ashaft carrying a pinion meshing with said gear Wheel, reduction gearingconnecting said shaft with the capstan, and intermediate gearingconnecting said shaft with the carrier shaft; whereby upon the closingof l said clutch the carrggrfgapstgn Iantitwspoal;are-` graduallybrought up to'speed Wit a corre` spending acceleration.

10. In a Wire insulatin machine, the combination with a frame, o a copcarrier supported thereby adapted when rotated to wind material fromsaid cop about a moving wire, a driving shaft, mechanism connecting saidcarrier with said shaft, a rocking arm controlling said mechanism, amagnet and means controlled bynsaid magnet when energized adapted tomove said arm to operate said mechanism and stop the carrier, aninsulated contact member carried by the frame through which the Wirepasses a-fter being covered, a circuit for said magnet terminating uponthe frame of the machine and said contact member, said circuit terminalsbeing connected by the bare wire when brought into engagement with saidcontact member,` and a switch controlling said circuit opened by saidarm when moved by said magnet.

11. In a Wire insulating machine, the combination with the frame, of acop carrier supported thereby adapted in its rotation to Wind insulatingmaterial from a cop about a moving Wire, a driving shaft, mechanismconnecting said carrier and shaft, a rocking arm controlling saidmechanism, a mag net adapted when energized` to rock said lever tooperate said mechanism and stop the carrier, an insulated contact memberthrough which the Wire passesafter being covered, a circuit for saidmagnet terminating upon said contact member and the frame of themachine, said circuit terminals being connected by the bare Wire whenbrought into engagement with said Contact member, a pair of insulatedswitch springs in said circuit, and an insulated contact piece carriedsai by said lever connecting said springs and adapted when the lever isrocked by said,

ma nettodisconnect said springs, and open circuit.

l2. In a Wire insulating machine, the com bination with the frame, of acop carrier supported thereby adapted when rotated to wind material fromsaid cop about a moving Wire, a driving shaft, mechanism connecting saidshaft and carrier, a rocking arm con trolling said mechanism, a handlefor the arm adapted to rock the same in a direction to operate saidmechanism and rotate the carrier, a spring adapted to move the arm in anopposite direction to operate said mechanism to stop the carrier, aspring-actuated lever adapted when the arm is rocked by y said handle tomaintain said arm in such position, an electromagnet, an armaturetherefor adapted when attracted to Withdraw said spring-actuated leverand allow the arm to be rocked in the reverse direction by said spring,an insulated contact memberl through Which the Wire passes after beingcovered, a circuit for said magnet terminating upon the frame of themachine and said contact member, said circuit terminals heilig adaptedto be connected by the bare wire when in engagement with said member, apair of insulated springs serially included. in said circuit, and aninsulated contact plunger carried by said handle adapted when the arm isheld by said springactuated lever to connect said springs, said handleand plunger being moved out of engagement With said springs when saidspring-actuated lever is Withdrawn.

In witness whereof, I hereunto subscribe my name this 12th day of AprilA. D., 1905.

FRANK I). PI AATTER.

